Fluctuation-induced excess conductivity in the compounds CaREBaCu3O7-y (RE=La and Sm)

Krishnan, H. ; Srinivasan, R. ; Sankaranarayanan, V. ; Subramaniam, C. K. ; Rao, G. V. Subba (1991) Fluctuation-induced excess conductivity in the compounds CaREBaCu3O7-y (RE=La and Sm) Bulletin of Materials Science, 14 (3). pp. 747-752. ISSN 0250-4707

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Official URL: http://www.ias.ac.in/j_archive/bms/14/3/747-752/vi...

Related URL: http://dx.doi.org/10.1007/BF02744719


The compounds CaREBaCu3O7-y (RE=La and Sm) are tetragonal at room temperature with Tc between 60 and 70 K. The single-phase compounds were prepared by solid-state reaction. The resistivity was measured by a four-probe technique in a continuous flow cryostat with the temperature being controlled to an accuracy of 10 mK. The resistivity vs temperature showed a break in slope around 180 K in CaLaBaCu3O7-y and around 220 K in CaSmBaCu3O7-y . The results were analysed for fluctuation conductivity from 180 K downwards. A plot of dp/dT vs T showed a sharp peak at Tm =69.69 K for La compound and 66.00 K for the Sm compound. Detailed analysis of the resistivity in the region Ton to 180 K was carried out using the procedure due to Veira and Vidal. The results are discussed in this paper.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:High Tc Superconductors; CaREBaCu3O7-y; Fluctuation; Excess Conductivity
ID Code:57934
Deposited On:30 Aug 2011 10:23
Last Modified:18 May 2016 09:09

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